Aquaman seems to save humans for profit, Cyborg was forced into his mechanical body, The Flash thinks its awesome, and so on.
They’re a motley crew that come from very different worlds, and therefore have vastly different perspectives on the business of crime fighting.
If Zack Snyder and Joss Whedon approach the film properly, the most interesting aspect of Justice League should be seeing how the various heroes interact with each other.
Seeing their philosophies and backgrounds clash while they attempt to function as a cohesive group should be a great character study, and hopefully it’ll be chock full of comedic moments.